package com.rx.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class LoginFilter
 */
@WebFilter("/admin/*")
public class AdminLoginFilter implements Filter {
	public AdminLoginFilter() {

	}

	public void destroy() {

	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {

		HttpServletRequest servletRequest = (HttpServletRequest) request;
		HttpServletResponse servletResponse = (HttpServletResponse) response;
		HttpSession session = servletRequest.getSession();

		// 获得用户请求的URI
		String path = servletRequest.getRequestURI();

		if (path.contains("login") || path.contains("images")) {
			chain.doFilter(request, response);
		} else {
			Object obj = session.getAttribute("username");
			// 没有登录
			if (null == obj) {
				String flag=servletRequest.getParameter("flag");
				if (null!=flag&&path.contains("/admin/AdminServlet")) {
					chain.doFilter(request, response);
				} else {
					servletResponse.sendRedirect("/admin/login.html");
				}
			} else {
				// 已登录
				chain.doFilter(request, response);
			}
		}
	}

	public void init(FilterConfig fConfig) throws ServletException {

	}

}
